<template>
  <!-- 1.盒子 -->
  <div :class="{flash: animated}"
       :style="{width, height}"
       class="xtx-skeleton">
    <!-- 2.闪效果 xtx-skeleton伪元素 -->
    <div :style="{background: bg}" class="block"></div>
  </div>

</template>

<script>
export default {
  name: 'XtxSkeleton',
  // 向外暴露一些属性: 高、宽、背景、是否有闪动画
  props: {
    bg: {
      type: String,
      default: '#efefef'
    },
    width: {
      type: String,
      default: '100px'
    },
    height: {
      type: String,
      default: '100px'
    },
    animated: {
      type: Boolean,
      default: false
    }
  }
}
</script>

<style lang="less" scoped>

.xtx-skeleton {
  display: inline-block;
  position: relative;
  overflow: hidden;
  vertical-align: middle;

  .block {
    width: 100%;
    height: 100%;
    border-radius: 2px;
  }
}

.flash {
  &::after {
    content: '';
    position: absolute;
    animation: flash 1.5s ease 0s infinite;
    top: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(to left,
    rgba(255, 255, 255, 0) 0,
    rgba(255, 255, 255, 0.3) 50%,
    rgba(255, 255, 255, 0) 100%);
    transform: skewX(-45deg);
  }
}

@keyframes flash {
  0% {
    left: -100%;
  }
  100% {
    left: 120%;
  }
}

</style>
